The universe's temporal sands are running dry, irreversibly.
Lin Jin, the last temporal sand mage, has a "Cinderfall Body" that lets him burn his life for a moment of power. Su Jin, a descendant of the tomb guardians, has temporal eyes that reveal the past and future shadows of all things. They meet in a doomsday world as barren as a desert of time, becoming each other's last anchor.
They discover that the temporal sands are not drying up because of a natural disaster. Deep beneath the glaciers, a mysterious force is extracting time from the entire universe, seeking to freeze a delusive eternity in absolute stillness. To uncover the truth, they venture into the eternally silent glaciers where time stands still, canyons of time fragments flowing upstream, and a sea of flowers blooming in an instant at the end of time...
Along the way, they encounter the surviving Shi Yao clan, trade with mysterious merchants who sell relics of time, and fight the legions of the Time-Silent, who worship "eternal stillness." As they decipher ancient inscriptions, a truth that overturns everything they know comes to light: the essence of the temporal sands is the crystallization of the emotions and memories of all life in the universe. It is not time that is drying up, but the hearts of civilizations, turning into deserts.
Lin Jin gradually realizes that what he burns is not his lifespan, but his "sense of existence." As long as even one person in the world remembers him, he can be reborn from the ashes. Su Jin learns that her eyes are not only meant to witness the end, but also to salvage the moments worth preserving forever at the world's end.
When the final enemy activates the "Time-End Engine," which devours time, intending to drag the entire universe into a dreamless eternal sleep, they face a choice:
Should they destroy the engine, allowing the world to proceed toward its inevitable end as it slowly withers away?